Ferrite powder, ferrite resin composite material, and electromagnetic shielding material, electronic material, or electronic component

Abstract

Provided are: a ferrite powder whereby, when the ferrite powder is applied in a composite material, dropping out of ferrite particles is suppressed without moldability and filling ability being compromised; a ferrite resin composite material; and an electromagnetic shielding material, an electronic material, or an electronic component. This ferrite powder includes at least spherical or polyhedral ferrite particles in which a step structure is provided on surfaces thereof, the step structure having a polyhedral outline in the surfaces of the ferrite particles.

The invention claimed is: 
     
         1 . A ferrite powder comprising spherical or polyhedral ferrite particles having a stepped feature on the surfaces thereof, wherein the stepped feature has polygonal contours on the surfaces of ferrite particles, and a mean interval between adjacent step edges is in a range of 3 nm or more or 50 nm or less. 
     
     
         2 . The ferrite powder according to  claim 1 , wherein the stepped feature has two or more steps. 
     
     
         3 . The ferrite powder according to  claim 1 , wherein the ferrite powder has a shape factor SF-1 of 100 to 110. 
     
     
         4 . The ferrite powder according to any one of  claim 1 , wherein the ferrite powder has a 50% diameter (D50) of 0.10 to 20.00 μm in a volume distribution of particle sizes thereof. 
     
     
         5 . The ferrite powder according to  claim 1 , wherein the ferrite powder has a composition of manganese (Mn) ferrite containing manganese (Mn) in a content of 4.0 to 17.0% by mass and iron (Fe) in a content of 50.0 to 70.0% by mass. 
     
     
         6 . A ferrite resin composite material comprising the ferrite powder according to  claim 1  and a resin. 
     
     
         7 . An electromagnetic shielding material, an electronic material, or an electronic component comprising the ferrite resin composite material according to  claim 6 .